Drying machine



N. C. HERO.

DRYING MACHINE. APPLICATION FILED FEB-9, I920.

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DRYING MACHINE.

APPLICATION FILED FEB. 9, I920.

1,403,778. Patented Jan.17,1922.

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V ATTORNEYS UNITED STATES PATENT OFFICE.

DRYING MACHINE.

Specification of Letters Patent.

Patented Jan. 17, 1922.

Application filed February 9, 1920. Serial No. 357,334.

T 0 all whom it may concern Be it known that I, NUMA C. HERO, a citizen of the United States, and a residentof New Orleans, in the parish of Orleans and State of Louisiana, have. invented certain new and useful Improvements in Drying Machines, of which the following a specification' My invention is an improvement in dryingmachines, and has for its object to provide a machine of the characterspecified adapted for dryinggranular material of any character, wherein a series of coaxially arranged rotatable cylinders visproVided, together with means for providing heated air and means for feeding the material to be dried to the cylinders, the said means delivering at opposite ends of the cylinders, one of the said means delivering into the alternate compartments formed between the-cylinders and the other into the intermediate compartments, the arrangement-being such that the largest possible amount of heat is utilized in the drying.

I In the drawings: I

Figure 1 is a longitudinal vertical section through the improved drier;

Figures 2 and 3 are sections on the lines 2-2 and 33, respectively, of Figure 1;

Figure 4 is a sectional detail taken at the suction fan;

Figure 5 is a similar detail of the feeding fan. Y

In the present embodiment of the invention a series of cylinders 1, 2, 3 and 4 is pro- 7 vided, arranged coaxially and one within the other, and one end of the cylinder 4 IS extended beyond; the corresponding end of the cylinders 1, 2 and 3, as shown. Referringto Figure 1, it will be seen that the machine as a whole is arranged in inclined position, all of the cylinders inclining ClOWI1 wardly from the hot air inlet end to the discharge end, and that the end of the cylinder 3 which projects beyond the cylinders 1, 2 and 4 at the hot air inlet end is received within anopening 5 in a furnace casing or fire box 6.

A labyrinth 7 is arranged between the extended end of the casing 3 and the fire box wall, as shown, and the fire box or furnace is provided with the usual bridge wall 8 and the grate 9 in front of the bridge wall. The top, of the casing and portions of the front and side walls are jacketed, as shown at 10, and series of conducting pipes 11 leads from this jacket at the front thereof, downwardly toward the bridge wall,above the grate, and thence rearwardly and upwardly through the smoke chamber to a collector pipe 12 winch is embedded in the furnace wall at this point.

Referring to Figure 1, it will be seen that the jacket 10 opens at the rear of the furnace casing, adjacent the manifold 12, so that the cold air enters at the rear, passes forwardly and then downwardly and upwardly, through the pipes 11, to the manifold 12.

A pipe 13 leads'the heated air from the manifold 12 to the rear end of the cylinders 1, 2, 3 and 4, delivering to a feeder blast fan casing 14 near the lower end thereof. This feeder blast fan casing connects by a loop 15 with the rear end of the cylinder 4, as clearly shown, and the front end of the cylinder 4 opens radially through the wall of the cylinder 3 near the hot air inlet end of the said cylinder,'to the space between the cylinders 2 and 3.

At the point opposite and slightly below where the pipe 13 opens into the fan casing 14 there is provided a feed pipe 16 for the material to be dried, and the material is fed through the pipe 16 to the fan casing 14 by means of aworm'or screw conveyor 17 arranged within the pipe 16 and delivering to the fan 14. The material to be dried and the heated air from the manifold 12 are delivered through the fan casing 14 and the loop 15, to a cylinder 4, by means of a fan 18 which is secured to a shaft 19 journaled axially. in the fan casing 14 and supported by a bracket bearing 20 from the fan casing 1 1-. This shaft 19 has a pulley 21, by means of which 'it maybe connected with av suit-- able source of power to rotate the shaft. From the cylinder 4 the material to be dried passes by wayof the lateral extension 22 of the cylinder 4 into the space between the cylinders 2 and 3. This cylinder 2 is open at its rear or lower end and the dried material is fed out at the said open end.

The air through the manifold 12 does not contact directly with the burning fuel and has no gases of combustion. The gases of combustion from the furnace feed through the cylinder 3 to the rear or lower end thereof and. pass outwardly by way of radial extensions or pipes 23 to the space between the cylinders 1 and 2. Thence the said gases pass forwardly through this space, to a stasource of power.

' ders thereon.

tionary header 24 at the higher or front end of the cylinders. v The header 24: is a drum which has a hub portion 25 extending into the opening 5 of the furnace casing and carrying one section of the labyrinth 7, and the other face of the drum has openings 26 which provide a communication with the interior of the cylinder 1. A pipe 27 leads downwardly from the header 2 1, to a fan casing 28 which 1s supported below the inlet ends of thecyllnand a fan 29 is arranged wlthm the casing,'thc fan being secured to a shaft 30 journaled in the casing wall and hav n a pulley 31 for connection with a sulta le The suction fan 29 causes a constant flow of heated air through the cylinders 1 and 3. p r

All of the cylinders are supported by wheels 32 which are secured to shafts 33 extending longitudinally of the cylinders at opposite sides thereof and supported by suitable bearing brackets or pedestals 34:.

Circular tracks35 are secured to the cylin der 1 near its ends, and these tracks, which are held in spaced relation with respect to the cylinder, engage the wheels 32' running The shaft 33 has a sprocket wheel 36, which may be connected by a sprocket chain with a suitable source of power to rotate the same.

The operation of the device is as follows:

"With the fire burning in the furnace and material'feeding through the pipe 16, when the cylinders are. rotated, the material fed through the pipe 16 will be fed,together with the heated air from the collector 12,

through the pipe l4c15'and the cylinder 4 those between the cylinders 1 and 2. The

air heated by the furnace, out of contact with the gases of combustion, is passed directly into contact with .the material, and no ases of combustion touch the said material. Thus while practically all of the heat is utilized in the gases of combustion, such gases do not touch the material.

' I claim:

1. A drier comprising outer, intermediate and central cylinders, means supporting said cylinders in an inclined position, a supply tube extending upwardly into said central cylinder and havin communication at its upperend with said intermediate cylinder, the upper end of said central cylinder being extended beyond the other cylinders, a furnace communicating directly with the upper end of said central cylinder whereby the products of combustion from the furnace pass through said central cylinder, and

means establishing communication between the lower end of said central cylinder and.

said cylinders, a supply member extendinginto said central cylinder and communicat: ing with said intermediate cylinder, a furnace having communication with said cen-' tral cylinder whereby the products of com-.

bustion from the furnace enter the central cylinder, and a conveyor feeding material to be dried into said supply member, said outer cylinder having communication with said centralcylinder whereby the products of combustion from the central cylinder pass through the outer cylinder.

4. A drier comprising outer, intermediate and central cylinders, means supporting said cylinders, a supply tube extending centrally into said central cylinder and having its upper end formed with a bend communicating with said intermediate cylinder, a furnace, the upper end of said central c' r inder having communication with the combustion chamber of said furnace whereby the products of combustion from the furnace enters the central cylinder, radially arranged tubes establishing communication between said central cylinder and said outer cylinder, and means for supplying. a quantity of heatedrair to said supply tube.

5. A drier comprising outer, intermediate and central cylinders, means supporting said cylinders, a supply tube extending centrally into said central cylinder and having its upper end formed with a bend communieating with said intermediate cylinder, means establishing communication between said central cylinder and'said outer cylinder, a fan casing communicating with said supply tube and having a fan directing a blast of air into said tube, and a conveyor supplying material to said fan casing.

6. A drier comprising outer, intermediate and central cylinders, means supporting said cylinders, a supply tube extending centrally into said. central cylinder and havingits upper end formed with abend communicating with said intermediate cylinder, means establishing communication between said central cylinder and said outer cylinder, a fan casing communicating with said supply tube and having a fan directing a blast of air into said tube, a conveyor supplying material to said fan casing, and means supplying heated air to said fan casing.

7. A drier comprising outer, intermediate and central cylinders, means supporting said cylinders, a supply tube extending centrally into said central cylinder and having its upper end formed with a bend communieating with said intermediate cylinder, means establishing communication between said central cylinder and said outer cylinder, a fan casing communicating with said supply tube and having a fan directing a blast of air into said tube, a conveyor supplying material to said fan casing, means supplying heated air to said fan casing, and

means creating an air suction through said central and outer cylinders.

8. A drier comprising outer, intermediate and central cylinders, means supporting said cylinders, a supply tube extending into said central cylinder and having communication with said intermediate cylinder, a plurality of radially arranged tubes establishing communication between said central and outer cylinders, a fan casing communieating with said supply tube and having a fan directing a blast of air into said tube, means supplying material. to be dried to said casing, means supplying heated air to said fan casing, and a furnace provided with a combustion chamber communicating with said central tube.

NUMA CHARLES HERO. 

